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GMC Sierra HD blasts into Detroit [video]

With a massive grille that matches a large 6.6-liter Duramax engine, General Motors rolled out the GMC Sierra All-Terrain HD Concept in Detroit today. The truck rides on 35-inch BFGoodrich KM2 tires that surround aluminum 20-inch wheels. Rounding out the truck's hugeness are impressively large fender flares.

In addition to the grandiose features, the truck is taller and wider than the GMC Sierra. The Sierra is a bit longer than the new concept.